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Peatland Biodiversity – a Technical

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Peatland Biodiversity – a Technical Peatland Biodiversity Nick Littlewood1*, Penny Anderson2, Rebekka Artz1, Olivia Bragg3, Paul Lunt4, Rob Marrs5 Scientific Review December 2010 1. Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, AB15 8QH 2. Penny Anderson Associates Ltd., Park Lea, 60 Park Road, Buxton, Derbyshire, SK17 6SN 3. Geography, School of Social and Environmental Sciences, University of Dundee, Perth Road, Dundee, DD1 4HN 4. University of Plymouth, A504 Portland Square, Drake Circus, Plymouth, Devon, PL4 8AA 5. Applied Vegetation Dynamics Laboratory, University of Liverpool, Liverpool, L69 3GP This review was commissioned by the IUCN UK Peatland Programme‟s Commission of Inquiry on Peatlands. The IUCN UK Peatland Programme is not responsible for the content of this review and does not necessarily endorse the views contained within. REVIEW Peatland Biodiversity Contents List of Figures and Tables 3 Summary 4 1. Introduction 6 1.1 Scope and Definitions 7 2. Biodiversity Values 8 2.1 Plants 9 2.2 Birds 13 2.3 Other vertebrates 15 2.4 Invertebrates 15 2.5 Microbial biodiversity 16 3. Drivers of Change 17 3.1 Drainage 17 3.2 Forestry 18 3.3 Cutting/Extraction 18 3.4 Grazing 19 3.5 Burning/Muirburn 20 3.6 Pollution 21 3.7 Construction and Development 22 3.8 Restoration Management 22 4. Status and Trends 23 4.1 Vegetation Trends 23 4.2 Condition Trends 24 4.3 Trends in Key Species 28 5. Good Management Practice 29 5.1 Grazing 30 5.2 Hydrology 30 5.3 Scrub Management 30 5.4 Burning 31 5.5 Restoration 31 5.6 Barriers to Good Practice 32 6. Possible Future Climate Change Impacts 33 7. Conclusions and Key Messages 34 Acknowledgements 34 References 35 2 REVIEW Peatland Biodiversity List of Figures and Tables Figure 1.1 The peatland hierarchy of elements 7 Table 2.1 The habitats regarded under the Habitats Directive as of community importance 8 Figure 2.1 The zonation of vegetation types within the microtopography of a bog 10 Table 2.2 UK BAP priority species occurring on ombrotrophic bogs 11 Table 2.3 Plant communities of ombrotrophic peatlands identified in the British National Vegetation Classification 13 Table 2.4 Breeding bird species on UK peatlands and their conservation status 14 Figure 4.1 Selected plant macrofossil data for Mynydd Llangatwg 23 Figures 4.2a-f Blanket bog states and impact on biodiversity 24 Figure 4.3a The condition of features on designated blanket bogs assessed by Common Standards Monitoring 27 Figure 4.3b The condition of features on designated lowland bogs assessed by Common Standards Monitoring 27 Table 4.1 Condition of designated and non-designated blanket bog in the Yorkshire Dales National Park surveyed between 2002 and 2008 28 Table 4.2 Trends in the number of breeding pairs of three wading bird species on the Flow Country of Caithness and Sutherland 29 3 REVIEW Peatland Biodiversity Summary Land covered in accumulated peat is known as peatland. It is active peatland if peat is being formed now. Estimates of the extent of peatland in the UK vary widely but most are between 1.5 and 2.5 million ha. The UK may host between 8.8 and 14.8% of Europe‟s peatland area and about 13% of the world resource of one peatland type, namely blanket bog. Indeed blanket bog forms the largest expanse of semi-natural habitat in the UK. The review focuses primarily on blanket bogs and on lowland raised bogs. Biodiversity Features Active bog is characterised by an abundance of bryophytes, especially the bog moss, Sphagnum. Different Sphagnum species, with different preferences for degree of ground wetness, form the characteristic hummock and pool systems and thus create topographical variation. The plant assemblage also includes a range of sedges and dwarf-shrubs and grades into associated habitats such as wet and dry heathland. The peatland vegetation assemblage, alongside high water levels, provides the key ecosystem service of laying down new peat accumulations and maintaining the peat store. Peatland biodiversity includes a range of rare, threatened or declining habitats, plants and animals. Some plant assemblages are better represented in the UK than anywhere else in the world. A significant number of peatland plant communities are considered to be of European importance. UK peatlands, especially blanket bogs, have a rich and unique breeding bird assemblage. It is a species-poor assemblage, although it contains an exceptionally high proportion of species with legal protection under UK and European conservation law. Iconic species for which UK peatlands are particularly important include golden plover, greenshank, red- throated diver, dunlin and common scoter. Some species, such as red grouse and hen harrier, will utilise habitat mosaics of peatlands along with wet and dry upland heathland and indeed many such areas are managed primarily to maximise grouse numbers for commercial shooting. Invertebrate assemblages on peatlands can be relatively species rich, especially for families that respond to small scale structural variation in vegetation and topography. Invertebrates on blanket bog play a key role in fragmenting plant litter as part of the peat accumulation process. Below-ground biodiversity is much less studied and the role that it plays in influencing vegetation change is little understood. Challenges There have been significant challenges to peatlands over the last 300 years in particular. A number of drivers cause peatland degradation. Peatlands close to industrial centres have previously suffered from SO2 pollution whilst N-deposition has increased over the last 50 years. Both of these adversely impact on Sphagnum in particular, whilst water-borne nutrient-enrichment has modified conditions for lowland raised bog and fen vegetation. Peatlands have historically been drained for agriculture and more recently been used for commercial forestry. Drain construction was carried out extensively through much of the 20th century and though it has now largely ceased, its legacies of peat shrinkage and erosion remain. Over-grazing and burning are currently the most significant ongoing activities that pose threats to blanket bog. Peatlands have a low carrying capacity for livestock and high grazing levels can suppress typical peatland vegetation. Burning impacts are poorly understood but may include adverse affects on Sphagnum. In lowland raised bogs, hydrological change is 4 REVIEW Peatland Biodiversity the most significant threat with drainage of the bog or adjacent land lowering the water table and causing loss of vegetation and other biodiversity that depends on waterlogged conditions. Recent construction, especially of wind farms and their associated infrastructure, have the potential to affect peatland habitats, particularly blanket bog, significantly. Climate change may exacerbate some of the negative drivers. Wildfire will become a greater threat in a drier landscape and increased storminess may cause greater erosion. Additionally there is already evidence of mismatches that could occur in the timing of seasonal activity between predator and prey populations. Impacts Only 18% of the most extensive peatland type in the British Isles, blanket bog, is currently in a natural or near-natural condition. Of the remainder, 16% is eroded, 16% is afforested, 11% is affected by peat cutting and 40% is modified. The impacts are not uniform. Blanket bog in Scotland is in better condition than further south. Lowland raised bog also tends to be in a better condition further north, although the picture is more mixed. Available evidence suggests that habitats on SSSI-designated peatland sites are in better condition that on non- designated sites. Peatland species show mixed trends but a majority of those designated as part of the UK Biodiversity Action Plan have declining populations. Peatland management Effective peatland management for biodiversity requires a good understanding of existing environmental and hydrological conditions. Under ideal circumstances peatland hydrology and grazing livestock can be controlled. However this is often difficult. Burning is generally discouraged. Peatland restoration is a realistic option in most situations and the best results for returning peatland biodiversity will occur where the hydrology can be controlled over a wide area in order to restore a peatland to an active state. However restoration may not always achieve a natural peatland and benefits may only be seen in the long-term. Co-ordination and dissemination of management information is important for maximizing the biodiversity potential of peatland management. Management for other benefits (e.g. carbon sequestration), if undertaken correctly, could promote typical peatland species and bring assemblage-level benefits at least in the long-term. The conservation of some species, though, may require further actions within and beyond peatland sites. Peatland management requires long-term commitment and can be costly to the practitioner. However society must recognise that it is good value compared to the overall costs of continued peat loss. Stakeholders should input to development of funding schemes to ensure that they can be implemented to the maximum benefit of peatland habitats. Key Points 1. Blanket bog forms the largest area in large blocks of terrestrial semi-natural habitat in the UK. It often occurs in a matrix with related habitats. 2. Peatland biodiversity is characterised by specialized species adapted to thriving in a waterlogged, mostly acidic, nutrient-poor environment. 3. The value of peatland habitats is recognised through UK and European legal obligations for their protection and restoration. 4. The peatland bird assemblages is recognised as internationally important. Many species breeding on peatlands have UK or European conservation designations and legal protection. 5 REVIEW Peatland Biodiversity 5. Peatlands have been subject to significant multiple negative drivers including burning, pollution, over-grazing and draining. 6. Only 18% of UK‟s blanket bog is now in a natural or near-natural state. The remainder is eroded, modified or has undergone land-use change (e.g. to forestry or peat extraction). 7. Biodiversity has been lost through peatland degradation.
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